S43.026 Posterior dislocation of unspecified humerus

Name of the Condition

• Posterior Dislocation of Unspecified Humerus

Summary

This condition involves the complete displacement of the humerus from the glenoid fossa of the scapula, with the humeral head moving backward (posteriorly). It typically results from trauma or injury and may cause pain, instability, or restricted movement in the shoulder joint.

Causes

The primary cause is trauma, such as a fall, direct blow to the shoulder, or forceful movement that exceeds the joint's normal range of motion. Sports injuries, motor vehicle accidents, or falls are common triggers. Repetitive overhead activities or underlying joint instability may also contribute.

Risk Factors

• Participation in contact sports or activities with high shoulder strain.
• Previous shoulder dislocations or subluxations.
• Age-related joint laxity or connective tissue disorders.
• Occupations requiring repetitive overhead movements.

Symptoms

• Intense shoulder pain, especially with movement.
• Visible deformity or abnormal shoulder contour.
• Swelling, bruising, or tenderness around the joint.
• Limited range of motion or inability to move the arm.
• Sensation of the shoulder "popping out" or feeling unstable.

Diagnosis

Diagnosis begins with a clinical examination to assess pain, deformity, and range of motion. Imaging studies like X-rays or CT scans may be used to confirm the displacement and rule out associated fractures.

Treatment Options

Treatment typically involves closed reduction to realign the joint, followed by immobilization with a sling. Physical therapy is often recommended to restore strength and mobility. Severe cases may require surgical intervention.

Prognosis and Follow-Up

Prognosis depends on the severity of the injury and adherence to treatment. Most patients recover with proper care, but some may experience long-term shoulder instability. Follow-up appointments monitor healing and rehabilitation progress.

Complications

Potential complications include recurrent dislocation, nerve or blood vessel damage, chronic pain, or arthritis in the shoulder joint.

Lifestyle & Prevention

Avoid high-risk activities or use protective gear during sports. Strengthen shoulder muscles through targeted exercises and maintain flexibility to reduce injury risk.

When to Seek Professional Help

Seek immediate medical attention if you experience severe shoulder pain, visible deformity, or inability to move the arm after an injury.

Tips for Medical Coders

Document the laterality (right/left/unspecified) and whether the dislocation is complete or partial. Ensure clinical notes specify the direction (posterior) and any associated injuries for accurate coding.